Austin pulled the double-ender alongside a ledge and wrapped the mooring line around a rocky knob. He slipped off his life jacket and foul-weather gear, climbed a short flight of natural steps and stepped into an opening shaped like an upside-down keyhole. He was im- mediately buffeted by a musty wind. The air was amplified like a trumpeter's breath as it flowed from the cleft, producing the haunt- ing moan of the dead mariners.

He clicked his flashlight on and followed a tunnel that eventually widened into a large cave. Three smaller caverns branched off from the main chamber. Painted on the wall next to each opening was a picture of a fish. Remembering Pia's instructions, he entered the cave marked by a sea bream. He soon found himself in a bewildering maze of caves and tunnels. Without the crude markers, he would have become hopelessly lost. After walking a few minutes, he en- tered a high-ceilinged chamber whose walls had been smoothed down and were covered with colorful renderings. He recognized the bison and deer from the drawings Pia's father had made. The ochre and red colors were still vibrant.

The pictures unfolded into a hunting scene that included antelope, wild horses and even a woolly mammoth. Hunters dressed in short kilts were shown attacking their prey with spears and bows and ar- rows. The mural encompassed vignettes of everyday life. There were scenes with people regally dressed in flowing robes, sleek sailing ships, two- and three-story houses of sophisticated architecture. The depiction of mammoths suggested that the drawings went back to Neolithic times, but this was a civilization of the highest order.

Austin followed the sea bream into a series of smaller caves and saw the remains of old fire-pits. He was more concerned with evi- dence of recent human occupation. The murmur of voices came from just ahead. He edged cautiously forward with his back plastered against a wall and peered around a corner into a cave the size of a small warehouse. The space looked like a natural cavern that had been expanded with the help of explosives and jackhammers. Flood- lights hanging from the high ceiling illuminated hundreds of plastic cartons stacked high on wooden pallets.

From the shadows, Austin watched a work crew of a dozen men dressed in black coveralls unload boxes from a forklift and place them on a conveyor belt. The workers were swarthy and dark- skinned, like the men he had seen in the patrol boat. They had straight, jet-black hair cut in bangs, high cheekbones and almond- shaped eyes. They were finishing their task, and after a while, half the work crew drifted out the door and the rest remained a few min- utes to clean up. At a word from a man whose air of authority tabbed him as the boss, they, too, straggled out through a door.